The "Remix" aspect of this ROM comes from the sheer variety of its library. It includes everything from minor graphical reskins to complete overhauls of the physics and level design.
High-effort hacks like Extra Mario Bros. and Mario Adventure transform the base games with new power-ups, inventory systems, and even non-linear world maps. Super Mario Bros Remix 45 In 1 Rom
At its core, the 45-in-1 is a curated collection of fan-made modifications (ROM hacks) bundled into a single NES-compatible file. Unlike official Nintendo releases like NES Remix on the Wii U, which focus on bite-sized challenges, this multicart offers full-length, modified versions of classic games. The "Remix" aspect of this ROM comes from
8MB (significantly larger than standard NES games). which focus on bite-sized challenges